/**
 *  就是之前的hystrix
 *
 *  访问sentinel管理界面
 *    http://localhost:8080
 *   登录账号密码均为sentinel
 *
 *   详细笔记
 *   https://www.jianshu.com/p/87bec2187912?utm_campaign=haruki&utm_content=note&utm_medium=seo_notes&utm_source=recommendation
 *
 *   资源名:
 *      1.可以是url
 *      2.也可以是 @SentinelResource(value = "testHotKey", blockHandler = "deal_testHotKey")  testHotKey
 *
 *   异常处理方式
 *      1.有默认的异常处理方式
 *      2.自定义异常处理方式
 *         @SentinelResource(value = "customerBlockHandler",blockHandlerClass = CustomerBlockHandler.class,blockHandler = "handlerException2") 指定了一个类
 *         @SentinelResource(value = "testHotKey", blockHandler = "deal_testHotKey")  当前类
 */